Drilling-machine.



R. HEFUN.

DRILLING MACHINE.

APPLICATION FILED Nov.18, 1915.

1,205,626. Patented N ov. 21, 1916.

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DRILLING MACHINE.

APPLICATION man Nov.18. 1915.

1,205,626. PatendNov. 21,1916.

2 SHEETS-SHEET 2.

HUMHINIWIMIIIIIHHH UNITED sTATEs TSATENT orricn.

RICHARD HEFLIN, OF SANDOVAL, ILLINOIS.

DRILLINGMACHINE.

Application led November 18, 1915.

To all whom 'it may concern:

Be it known thatI, RICHARD HEFLIN, a citizen of the United States of America, rcsiding at Sandoval, in the county of Marion and State of Illinois, have invented certain new and useful Improvements in Drilling-- Machines, `of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to improvements in drilling machines, and more specifically stated, to a drilling machine particularly adapted for use in drilling into coal deposits.

In the practical use of drilling machines in coal mines, the drills will sometimes operate quite freely, but, when forced into sulfur or other hard material, considerable power is required to operate the drills. Time and labor may be saved by operating the drill very rapidly while it is passing through the soft material, but when the drill encounters the comparatively hard ma.- terial a. higher degree of power is required and the speed of the drill should be reduced.

rlherefore, one of the objects of the invention is to produce a simple and inexpensive drillingv machine having an operating wheel, or drive wheel, and a transmission dcvice for transmitting movement from said wheel to the drill, said transmission device including a transmission wheel, and one of said wheels being adjustable with respect to the other so as to vary the speed of the drill with respect to the speed of the` drive wheel. Thel drive wheel is adapted to be turned by hand, and the parts are constructed and arranged in such a manner that-the drill may be easily turned at a high rate of speed in drilling through soft material, and when the drill is to be forced through sulfur or other comparatively hard material, the parts may be adjusted to reduce the speed of the drill with respect to the speed of the drive wheel, thereby enabling the more difcult drilling operation to be` performed without materially increasing or decreasing the speed of the manually operated drive wheel.l

lVith the foregoing and other objects in view the invention comprises the novel construction, combination vand arrangement of parts hereinafter more specically described and illustrated in the accompanying drawings in Whichl Figure I is a plan view, partly in section,

Specification of Letters Patent.

Ving sections in their operative positions.

Patented Nov. 21, 1916.

serialivo. 62,105. Y Y

of a drilling machine constructed in accordthey appear when the transmission device is in operative lengagement with the larger row of teeth on the drive wheel. Fig. IV lis a vertical section taken approximately through the center ofthe machine. Fig. V is a detail view of one of the transmission Wheels.

l designates a supporting frame provided at its'lower end with a pin 2 adapted to be forced into the Hoor orfbottom wall ofa mine tunnel, and having a pin 3 adapted to be forced into the roof or top wall of the mine tunnel. VA supporting' member A, slidably fitted t0 the supporting frame 1, may be adjusted vertically and it may be secured in differentpositions by a set screw 4. A bearing seat B is provided with a pair of trunnio-ns 5 which extend into thepsupporting member A, as shown in Fig. IV. A shiftable bearing C, resting upon the' bearing seat B, comprises a lower bearing section 6, an upper bearing section 7 and a hinge 8 connecting said bearing sections. A lug 9, eX- tending upwardly from the lower bearing section, passes through a marginal portion Vof the upper bearing section, and a key 10 i fitted to said lug to retain the hinged bear- A sectional sleeve 12, secured between the bearing sections 6 and 7, is threaded internally to receive a feed screw 13, as shown most clearly in Fig. I. The drill 14 is secured in a socket 15 at one end of the feed screw 13.

A transmission wheel 1G, in the form of a bevel gear wheel, is fitted to `one end of the bearing C and splined to the feed screw 13, said transmission wheel 1G being provided witha pair of keys 17 (Fig. V), and the feed screw having longitudinal grooves for the reception of said keys. The transmission wheel 16 is not threaded and it does not advance with the feed screw. This wheel may be rotated to turn the feed screw in the threaded sleeve 12, thereby rotating, and at the same time advancing the drill 111. The transmission device also includes a bevel gear wheel 18 meshing with the Wheel 16, a gear Wheel 19 formed with radial teeth, and a short shaft 2O connecting said Wheels 18 and 19. The shaft 20 is rotatably mounted in a bearing 2l (Fig. I) said bearing being attached to a corner of the feed screw bearing.

A multiple drive wheel D is provided with a gear ring 23 and a gear wheel 24, said parts being fastened together to form a unitary member having its teeth projecting toward the periphery of the drive wheel. The circular row of teeth on the gear ring 23 is larger in diameter than the circular row of teeth on the gear wheel 24, and these circular rows of teeth are concentric with the axis of the drive wheel. The teeth on both the gear-ring 23 and the gear wheel 24 are radially arranged. An operating handle 25 is fastened to the drive wheel D. Y

The transmission wheel 19 is adapted to mesh with the gear wheel 24, as shown in Fig. II, and the parts may be adjusted to place said transmission wheel 19 in engagement with thevteeth of the large gear ring. To provide for such adjustment, the mul tiple drive wheel D, including the gear members 23 and 24, is rotatably mounted on a laterally extending stud 26 extending from the supporting member A, and it is retained on said stud by a collar 27 fitted to the square end portion of the stud, and a key 28 securing said collar to the stud. The key 28 land collar 27 may be removed from the stud 26 to permit the removal of the drive wheel, thereby permitting the transmission device to be shifted from one of its operative positions to the other.

The means for securing the transmission device in its different operative positions, comprises depending lugs 30 and 31 extending downwardly from the bottom of the bearing member 6 and adapted to occupy or pass through an aperture 32 in the bearing seat B, see Fig. III. When the parts occupy the positions shown in Fig. III, the transmission Wheel 19 meshes with the teeth of the large gear ring 23, and a lug 31 extends through the bearing seat B. A key 33,`passing through the lug 3l, secures the transmission device in the position shown in Fig. III. In shifting the transmission device from the position shown in Fig. III to the position shown in Fig. Il, the drive wheel including the gear members 23 and 24: is removed from the stud 26, the bearing C and the elements secured thereto are lifted to remove the lug 31 from the bearing seat B, and then moved rearwardly to locate the lug 30 in the aperture 32. The key 33 is then inserted through the lug 30 to secure the transmission device in the position shown in Fig. II, and thereafter the drive Y the speed of the drill with respect t'o the speed of the drive wheel.` Under both of the conditions referred to, the drive Wheel may be turned at approximately the same rate of speed, and the labor required to turn the drive wheel one revolution may be approximately the same under both conditions, the variations in power and speed being compensated for by adjusting transmission device.

By constructing and arranging the parts as herein shown, they may be adjusted to vary the relative speeds of the drive wheel and drill, without changing the relative speeds of the transmission wheels and feed screw.

I claim A drilling machine comprising a supporting frame, an adjustable supporting member, iitted to the ysupporting frame, having a laterally extending stud, a bearing seat having a lug-aperture in the bottom thereof and provided with a pair of trunnions whereby it is mounted in the sup porting member, a shiftable bearing mounted in the bearing seat, consisting of a lower bearing section having bearing lugs adapted to occupy the lug-aperture in the bearing seat, and an upper bearing section secured to the lower bearing section, an internally screw-threaded sectional sleeve, secured between the bearing sections, a longitudinally grooved feed-screw adapted to work in the sectional sleeve, a bevel gear wheel splined to the feed screw and fitted to one end of the shiftable bearing, a bevel gear wheel meshing with the first mentioned bevel gear wheel and provided with a transmission gear wheel, and a multiple drive wheel, mounted on the laterally extending stud, having an inner gear wheel and an outer gear ring adapted to engage the transmission gear wheel.

RICHARD HEFLIN.

copies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patents. Washington, D. C. 

